The characteristics of species composition, quantity distribution and biodiversity of intertidal benthos in Nanpeng islands of Guangdong Province were analyzed in this study. Eighty species were found which belonged to 35 families. Mollusk, Crustacean and algae were the most abundant species, which comprised 84％ of the total species. and some of them were commercial species with high economic value. The average biomass and density of intertidal benthos in Nanpeng islands were 1，83131g/m2 and 21867 ind/m2, respectively. The algae and mollusks were the dominant species in biomass and density, respectively. The Shannon-Winer diversity index (H) was at high levels, distributing between a range of 3.32~3.57 with an average of 3.42; and its evenness (J) was between 0.81~0.87, with the average of 0.84.